H-β zeolite modified Pd/Al_2O_3 catalysts were prepared by impregnation.Effects of adding method and content of H-β zeolite on the catalytic performance were studied by XRD, BET, NH_3-TPD and other analytical characterization techniques, as well as the reaction system with methyl oleate as model compounds studied.The results showed that the interaction among the components of Pd-Al_2O_3-BEA catalyst has a great difference because of the different adding method of H-β zeolite, thus its catalytic properties w...